CY8CTST110
Document Number: 001-46931 Rev. *B
Page 2 of 32
TrueTouch Functional Overview
The TrueTouch family provides the fastest and most efficient way
to develop and tune a capacitive touchscreen application. A
TrueTouch device includes the configurable TrueTouch block,
configurable analog and digital logic, and programmable inter-
connect. This architecture enables the user to create flexible,
customized touchscreen configurations to match the require-
ments of each individual touchscreen application. Various
configurations of Flash program memory, SRAM data memory,
and configurable IO are included in a range of convenient
pinouts.
The TrueTouch architecture consists of four main areas: the
Core, the System Resources, the Digital System, and the
TrueTouch Analog System. Configurable global bus resources
allow combining all the device resources into a complete custom
touchscreen system. Each CY8CTST110 TrueTouch device
includes four digital blocks and the TrueTouch controller block
that provides single-touch sensing and scanning control circuitry
for touchscreen applications. The CY8CTST110 is offered in a
32-pin QFN package with up to 28 general purpose IO (GPIO),
and support of up to 24 X/Y sensors.
When designing touchscreen applications, refer to the UM data
sheet for performance requirements to meet and detailed design
process explanation.
The TrueTouch Core
The Core is a powerful engine that supports a rich instruction set.
It encompasses SRAM for data storage, an interrupt controller,
sleep and watchdog timers, and IMO (Internal Main Oscillator)
and ILO (Internal Low speed Oscillator). The CPU core, called
the M8C, is a powerful processor with speeds up to 24 MHz. The
M8C is a four MIPS 8-bit Harvard architecture microprocessor.
System Resources provide the following additional capabilities:
■ Digital clocks to increase the flexibility of the PSoC
mixed-signal arrays.
■ I2C functionality to implement an I2C master and slave.
■ An internal voltage reference, MultiMaster, that provides an
absolute value of 1.3V to a number of TrueTouch subsystems.
■ Various system resets supported by the M8C.
The Digital System consists of an array of digital blocks that may
be configured into any number of digital peripherals. The digital
blocks are connected to the GPIO through a series of global
buses that can route any signal to any pin, freeing designs from
the constraints of a fixed peripheral controller.
The Analog System consists of four analog PSoC blocks,
supporting comparators and analog-to-digital conversion up to 8
bits in precision.
Implementation of touchscreen applications allow additional
digital and analog resources to be used, depending on the touch-
screen design.
The Digital System
The Digital System consists of four digital PSoC blocks. Each
block is an 8-bit resource that is used alone or combined with
other blocks to form 8, 16, 24, and 32-bit peripherals, which are
called user module references. Digital peripheral configurations
include the following.
■ PWMs (8 to 32 bit)
■ PWMs with dead band (8 to 32 bit)
■ Counters (8 to 32 bit)
■ Timers (8 to 32 bit)
■ UART 8 bit with selectable parity
■ SPI master and slave
■ I2C slave and multi-master
■ Pseudo random sequence generators (8 to 32 bit)
The digital blocks are connected to any GPIO through a series
of global buses that can route any signal to any pin. The buses
also allow signal multiplexing and performing logic operations.
This configurability frees your designs from the constraints of a
fixed peripheral controller.
Digital blocks are provided in rows of four, where the number of
blocks varies by TrueTouch device family. This allows the
optimum choice of system resources for your application. Family
characteristics are shown in Table 1 on page 4.
Figure 1. Digital System Block Diagram
DIGITAL SYSTEM
To System Bus
DigitalClocks
FromCore
Digital PSoC Block Array
ToAnalog
System
8
8
8
8
Row 0
DBB00
DBB01
DCB02
DCB03
4
4
GIE[7:0]
GIO[7:0]
GOE[7:0]
GOO[7:0]
Global Digital
Interconnect
Port 3
Port 2
Port 1
Port 0
[+] Feedback
Portuguese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
